During invasive mechanical ventilation, maintaining endotracheal tube cuff pressure (Pcuff) around 25 cmH2O is recommended for sealing the upper airways. The continuous control of Pcuff with a simple mechanical device, the Tracoe Smart CuffmanagerTM, has never been assessed. The investigators hypothesize that the Tracoe Smart CuffmanagerTM would allow a reduction of the incidence of underinflation episodes, as compared with the intermittent strategy of Pcuff control.